/*服务发现Discovery*/
    @GetMapping("/discovery")
    public Object discovery(){
        /*
        这个services是指的:所有的微服务注册的名称CLOUD-CONSUMER-ORDER | CLOUD-PAYMENT-SERVICE
        */
        List<String> services = discoveryClient.getServices();
        for (String element : services) {
            log.info("******element:"+element);
        }
        //这里的instances是: payment8002 , payment8001
        List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");
        for (ServiceInstance instance : instances) {
            //serverId:CLOUD-PAYMENT-SERVICEhost:192.168.200.1 port:8002
            //serverId:CLOUD-PAYMENT-SERVICEhost:192.168.200.1 port:8001
            log.info("*****serverId:"+instance.getServiceId()+"host:"+instance.getHost()+"port:"+instance.getPort());
        }
        return this.discoveryClient;
    }